If American Express can integrate its cards with popular cryptocurrencies; such as bitcoin and ethereum, it would expand its reach particularly in the developing world. An intriguing option would be a card that pays reward points in bitcoin or ethereum. A long term revenue generator would be a card that allows for transactions in several different crypocurrencies; such as Litecoin, Bitcoin and ethereum. A company called TenX is already developing such a card in Singapore.

Two of Canada’s Big Five banks; TD and RBC, are not on the list of those supporting Android Pay. Both institutions support Apple Pay so that’s a real blow to Android Pay north of the border. Interac debit cards are scheduled to start supporting Android Pay on June 5.

Another notable absence is American Express which is supporting Apple Pay in Canada. Amex supports Android Pay in the United States so it should not be long before that card supports it in Canada. This was the second major rollout for Android Pay in a little over a week. The app debuted in Russia on May 23.

So far you can only access Visa (NYSE: V) and MasterCard (MA) through Microsoft Wallet. American Express and Discover are not mentioned at its website. Just eight banks are mentioned but only two major US banks accept it; Bank of America and US Bank. One major Canadian Bank TD Bank is also mentioned at the website. Chase is listed there as coming soon

As you can see, many of the biggest names in American retail are still missing from the list, including the nation’s largest supermarket operator, Kroger, which owns such chains as Ralphs, Fred Meyer, Smiths, Harris Teeter, and King Sooper’s. All of the dollar store operators; Walmart, the largest retailer in the universe; Amazon.com; most department stores; and all of the hardware and home improvement stores are also missing.